Same cost to retake the exam would be another $250. Just follow the exam prep guide listed on the site which is very detailed and you will be fine.
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First Of all No negative thoughts. All the best.
The cost of retake exam is same $250.
Here there is a link which will explain some of the answers to the sample questions.Tableau Certification Preparation Guide -Desktop 9 Qualified Associate- TableauLearners TableauLearners